Multiplus-ll firmware v556 changelog...?

DIY
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I spent over an hour looking for firmware changelog and gave up and thought I’d ask.

Thinking about updating from v510 to v556…but it sure would be nice to have a change log to review before I do. Can anyone point the way?

I signed up on victron profesional but still not sure I’m looking at the right thing…crazy.

thx
Lee

2

Changelog firmware (6).docx (52,4 KB)

3

Victron Professional is the right place and it’s not really hidden:

IMG_20250321_233848
IMG_20250321_2338481080×1817 164 KB

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Thx…yeppers, saw this.

Then was looking for v556 on the list. What am I not deciphering at this point??

THx

5

Recent (last 10 months) changes are:

xxxx556 (including s99) March 19,2025

  • Fixes instability issues (during PowerAssist/Charge/FeedIn) which became apparent with revision 555.

Update advice:
Whether this instability occurs is highly dependent on the installation and not easy to predict. Some models are more prone to this than others.
There is no urgency in replacing 555 with 556 when system is running well.

xxxx555 (including s99) March 3, 2025

  • Improve system stability for Charge and PowerAssist in combination with certain gensets. On all tested gensets, the system now works stable without the need to enable the Weak AC Input setting.
    (nb This improvement is available when the selected gridcode is “None” or “Other”)

  • Added support for the German §14a EnWG requirement.
    Battery charging of the system is limited to 4.2kW when the AUX2 input of the L1 phase master is “closed”.
    xxxx554 Released only for a few models:

  • Change in Denkmark gridcode: Default value for reactive power curve filter time is 1s instead of 3.3s for devices>5K

  • Several “under the hood changes”

xxxx553 Released only for a few models:

  • Added the ParallelCompatiblityID mechanism which is used to check whether certain models can run in parallel/3 phase.
    xxxx552‑s99 June 19, 2024

  • -s99 firmware is dedicated firmware which must be used when using an external transfer switch with a Multiplus-II (or similar) model.
    See external transfer switch manual for a detailed explanation.
    (Please note that -s99 firmware is only available for Multiplus-II and some similar models)

xxxx552 June 14, 2024

  • Bug removed which resulted in E8 (GND relay failure) on some 120V models.

For the non affected models (mostly 230V) there is no functional difference with 551. Only the version number is different

xxxx551 June 11, 2024

  • Adjusted some regulation constants for the standard MultiPlus/Quattro’s (non Multiplus-II devices) to solve the issue that in some installations the requested power setpoint was not followed for no apparent reason.
  • Gridcodes for Spain, South-Africa, Denmark and New Zealand (NZS4777M) are made available for non Multplus-II devices (external IP protection required!!)
  • Some under the hood improvements.

This release is available for 230V only. The files for 120V were available for download shortly, but unfortunately they have an issue with the ground relay. We’re looking into the issue, and once found, fixed and verified will release that as v552 or a later version number.

xxxx550 April 18, 2024

  • First release, functionality equal to 510 except for the Quattro-II
  • Some changes for the Quattro-II which helps prevent E11 in installations with load-shedding.
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@M_Lange highlighted a file in his screenshot called “Changelog firmeare.docx”. Download this, it is a running history of all firmware changes and is updated with rach new version.

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Thank you!